US6662321B1 - Modem using phase coherence to adapt for missing transmission samples - Google Patents
Modem using phase coherence to adapt for missing transmission samples Download PDFInfo
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- US6662321B1 US6662321B1 US09/532,346 US53234600A US6662321B1 US 6662321 B1 US6662321 B1 US 6662321B1 US 53234600 A US53234600 A US 53234600A US 6662321 B1 US6662321 B1 US 6662321B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
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- This invention relates to modem technology, and more particularly, to a modem that adjusts for missed code samples during transmission of data.
- modems During transmission of data, modems typically buffer digitized data representing the analog transmission for that transmission. This buffered data is originally processed by the main central processing unit of a host computer and transferred to the modem via a link over an internal bus in the computer.
- the data to be transmitted to the remote unit is processed by the host computer into digital samples representing the outgoing analog signal and are stored in the memory of the host computer, awaiting transfer to the modem. Upon transfer to the modem, the digitized samples are stored within a transmit buffer in the modem. When the data is to be transmitted to a remote modem, the modem performs a digital to analog conversion on these digitized samples. The modem then outputs the resulting analog waveform across the communication link to the other modem.
- the modem when the modem receives analog signals from another modem, the receiving modem typically digitizes the analog waveform as samples and store these samples in an internal buffer. The modem then ships the digitized samples of the analog waveform to the host computer's memory via an internal bus, where the host computer processes the samples to recover the embedded data in the original analog signal.
- the modem may exhaust all of the data in the transmit buffer.
- the transmit buffer has exhausted the supply of digitized samples representing the output analog signal, an indeterminate signal can be output by the modem.
- the sending of the unspecified signal across the communication link could result in abnormal noise in the transmitted audio waveform.
- the abnormalities may include a disruption in the phase of the audio waveform.
- Different varieties of abnormal waveforms are diagrammed in FIGS. 1 a and 1 b.
- FIG. 1 a is a timing diagram of an analog signal 100 output by a modem when the transmit buffer is in an underflow condition.
- the transmit buffer In the period before a time T 1 , the transmit buffer is not in an underflow situation and has valid data corresponding to samples of a valid transmitted waveform. However, at the time T 1 the transmit buffer enters into an underflow situation, perhaps caused by a delay in receiving digitized samples from a main memory.
- the resulting analog signal transmitted by the modem at the time T 1 is very noisy, due to the fact that no coherent data is being output.
- FIG. 1 b is a diagram of an even worse case scenario.
- the modem is outputting an analog signal 150 to a remote modem.
- the transmit buffer of the modem is operating normally until a time T 2 .
- an underflow in the transmit buffer occurs, again perhaps caused by the delay in receiving the digitized samples representing the output analog waveform 150 from a main memory or other peripheral device. This described delay is among other types of delays inherent in computer systems that could cause the transmit buffer to underflow.
- the modem cannot transmit valid, coherent data over the communication link. As such, the modem proceeds to transmit an out of phase signal.
- An out of phase, non-coherent, or noisy signal is extremely destructive in terms of a modem session.
- the transmissions of extremely noisy data, such as depicted in FIG. 1 a , or the transmission of a non-coherent, discontinuous signal, such depicted as in FIG. 1 b may lead to lower performance in the modem. In fact, even more destructively, these types of signals may cause a termination of a communication link between another modem.
- the invention relates to a modem that is able to adapt to missed transmission samples by supplying a patch signal for the missing samples.
- the patch samples do not affect the operation of the modem in a communication session that it is currently engaged.
- the modem is made up of a conversion circuitry, a buffer for storing samples from the conversion circuitry, and a second buffer containing samples of a substitute signal.
- the modem recieves digital samples from a main computer, which are then stored a transmission buffer.
- the modem transforms the digital samples into an analog signal, which it then outputs.
- the digital samples are transformed into the analog signal by the conversion circuitry
- a second buffer contains digital samples of a substitute analog signal.
- the digital samples from the second buffer are substituted as input to the conversion circuitry.
- the conversion circuitry transforms the digital samples contained in the second buffer into an analog output coherent with the prior output signal.
- the output of the modem is uninterrupted due to the lack of digital samples in the transmission buffer, and transmits a coherent analog signal that will not impair the communication session.
- the contents of the second buffer are tracked or synchronized with the output of the digital samples from the first buffer to the conversion circuitry.
- a related digital sample from the second buffer may be substituted seamlessly with the prior digital samples sent form the transmission buffer.
- the resulting analog signal output from the conversion circuitry is seamless as well.
- the digital samples in the second buffer are indicative of a signal coherent with the signal as represented by the samples in the transmission buffer.
- the substitution of a sample from the second buffer for a missing sample in the transmission buffer results in a coherent output from the conversion circuitry.
- the second buffer stores samples of a cyclical signal. Further, the second buffer stores samples indicative of at least one cycle of the cyclical signal. In this way, a patch from the second buffer is readily available at any point in the output cycle. This gives the modem the ability to graft the delayed signals from the computer onto the ongoing output analog signal.
- FIGS. 1 a and 1 b are timing diagrams of analog signals output by a modem when the transmit buffer has experienced an underflow or signals representative of missed samples from an overflow condition in a reception buffer.
- FIG. 2 is a timing diagram of an analog output of a modem with missing samples, a patch analog output tracked by the modem to compensate for the missing signal samples, and a resulting composite signal output by the modem according to the invention.
- FIG. 3 is a schematic block diagram of an embodiment of a device that performs a phase coherence adjustment for missed code samples according to the invention.
- FIG. 4 is a timing diagram showing the interaction of an outgoing analog signal, and the coherent phase buffer of FIG. 3 .
- FIG. 2 is a timing diagram of an analog output of a modem with missing samples, a patch analog output tracked by the modem to compensate for the missing output signal samples, and a resulting composite signal output by the modem according to the invention.
- a modem is transmitting data, exemplified by an analog signal 200 .
- Samples corresponding to the analog signal 200 are present in a transmit buffer of a modem. The samples are converted to the analog signal 200 and output on a communication line.
- the transmit buffer experiences an underflow situation. As, such no valid data samples are present in the transmit buffer to be converted and transmitted. However, the data sample stream is resumed at a time T 2 , at which time the underflow situation in the transmit buffer is corrected. As such, an analog output signal 204 may be resumed at that time. However, the in the time between the time T 1 and the time T 2 , no valid samples of an analog output signal are present in the transmit buffer that may be converted and output by the modem.
- the modem may compensate for the lost transmission samples by patching the output signal with an in-phase, non-noisy, coherent waveform, as indicated by an analog waveform 212 .
- the modem stores digitized samples of a patching waveform.
- the modem tracks the output waveform. This enables the modem to patch the output waveform in the proper location.
- the modem may supply a patching waveform 212 by supplying alternate digital samples corresponding to the patching waveform 212 to the output in lieu of the invalid digital samples in the transmit buffer. This substitution continues while the transmit buffer is in an underflow situation.
- the patching waveform corresponds to a “dataless” waveform; thus no information is transmitted in the patch.
- the modem upon the indication of an underflow situation in the transmit buffer, supplies a patching waveform 212 to the output until the underflow situation is corrected.
- the modem supplies an uninterrupted, continuous, coherent, and non-noisy waveform 230 as the analog output to the communication link.
- the modem supplies the samples corresponding to the waveform in the time before the time T 1 from the transmit buffer, as indicated by the waveform segment 220 .
- the analog output generated by the modem is derived from those samples corresponding to the patch waveform generated internally, as indicated by the waveform segment 222 .
- the patch waveform is continued until the underflow situation is corrected at the time T 2 .
- the samples of the delayed new data flowing into the transmission buffer are resumed.
- the transmission from the delayed data may be resumed, as indicated by the waveform segment 224 .
- an analog output waveform 230 is a composite waveform.
- the composite waveform is made up of the waveform segments 200 , 212 , and 204 .
- the communication session is not affected by the absence of samples in the period of time between the time T 1 and the time T 2 .
- FIG. 3 is a schematic block diagram of an embodiment of a device that performs a phase coherence adjustment for missed code samples according to the invention.
- FIG. 3 is an internal schematic of a host computer containing a modem 3300 .
- the host computer contains a computer bus 350 , a memory 360 , and another device 370 operably coupled to the computer bus 350 and possibly requiring access to the memory 360 .
- the digital output stream buffer 364 is an area of memory in which digital samples corresponding to an output analog transmission signal is stored before sending to the modem 330 for final transmission.
- the modem may utilize the digital output stream buffer 364 of the memory 360 to create digitized samples of output analog signal. Or, the modem may output these digitized samples from a digital signal processor.
- the modem 300 Periodically, the modem 300 requests a block of the digitized samples contained in the digital output stream buffer 364 in the memory 360 for output to a remote modem as an analog output signal. Or, these digitized samples may be requested from a specialized piece hardware, such as a digital signal processor.
- this requested block of samples is transferred across the computer bus 350 and into the transmit buffer 324 contained within the modem 3300 .
- the digitized samples of the analog output signal are sent to the conversion circuitry 320 .
- the conversion circuitry 320 converts the digitized samples of the analog output signal to a resulting analog output signal. This analog signal is output through the input/output port to a remote modem.
- the computer peripheral device 370 may block the modem 3300 from obtaining the digitized samples stored in the memory 360 .
- the computer peripheral device 370 may request another peripheral device supply some data using the computer bus 350 . Again, access to the computer bus 350 would be blocked from the modem 3300 . As such, the digitized samples corresponding to the output of the modem 300 might be delayed.
- the transmission buffer 324 may enter an underflow state.
- Additional control circuitry 340 may also present with the modem 3300 .
- This control circuitry 340 may be onboard to the modem. Or the control circuitry may be a remote processor running the functional protocol of the modem, as might exist in a software modem. Thus, the control circuitry 340 controls the functional aspects of operating the transmission buffer.
- the modem 300 also contains a coherent phase buffer 330 .
- This coherent phase buffer 330 contains data corresponding to samples of an analog signal that the modem may use in patching an output analog signal as it waits for delayed data from the main computer.
- the processing circuitry 340 allows the modem to direct the introduction and matching of the phase coherent samples to the output signal. As such, when the digitized samples are delayed from the memory 360 , the modem may use the digitized samples in the coherent phase buffer 330 to adjust for any missed samples because of these delays.
- the representation of the signal contained in the coherent phase buffer 330 is “dataless”, meaning that it is representative of a carrier wave containing no embedded data. With such a wave, the contents of the coherent phase buffer may be used in the “patching” functions in building a phase coherent analog signal that adjusts for missed code samples.
- the modem 300 can compensate for this situation by providing digitized samples from the coherent phase buffer 330 to the conversion circuitry 320 .
- These samples from the coherent phase buffer 330 represent an analog signal that is in phase, coherent with, and non-discontinuous from the ongoing output signal.
- an underflow condition in the transmission buffer 324 is detected by the modem 300 .
- the modem 300 Upon an indication that this event had occurred, the modem 300 would send the samples from the coherent phase buffer 330 corresponding to an analog signal coherent with the ongoing output signal to the conversion circuitry 320 .
- the modem 300 Upon an indication from the modem 300 that the underflow condition in the transmission buffer 324 no longer exists, the modem 300 ceases sending the samples in the coherent phase buffer 330 to the conversion circuitry 320 .
- the sample stream from the coherent phase buffer 330 replaces a sample stream from the transmission buffer 324 .
- the samples from the transmission buffer 324 replace those from the coherent phase buffer 330 , since valid digital samples of an analog output signal are now present in the transmission buffer 324 and are available for output to the conversion circuitry 320 .
- the portions of the modem 300 may exist in hardware, or in software, or in some combination thereof.
- the coherent phase buffer 330 or the transmission buffer 324 may be implemented in software, as well as being implemented in physical embodiments.
- the coherent phase buffer may also be used in another manner.
- the modem 300 may monitor the status of the transmission buffer 324 . When the level of the outgoing samples in the transmission buffer 324 reaches a predetermined low level, the modem 300 may start to use the appropriate samples out of the coherent phase buffer 330 . In this manner, the level of valid samples in the transmission buffer always remains positive. When the level of valid samples reaches a level in which the modem can operate in a normal manner again, the modem 300 will again substitute back to using the samples from the transmission buffer 324 .
- FIG. 4 is a timing diagram showing the interaction of an outgoing analog signal, and the coherent phase buffer of FIG. 3 .
- a modem produces an outgoing analog transmission signal 400 .
- the modem receives digitized samples of the outgoing data, represented by the solid arrows within the signal 400 , from a computer memory.
- the modem puts these samples into a transmission buffer, from where the samples are sent to a conversion circuitry.
- the conversion circuitry converts the digital samples into the signal 400 .
- a coherent phase buffer 410 contains samples 412 a-n of a signal that correspond to the output carrier signal of the modem. As the samples in the transmission buffer are sent to the conversion circuitry and later output as an analog signal, a pointer 420 marks the sample in the coherent phase buffer 410 containing a corresponding sample of the analog output signal coherent with the outgoing signal. As each sample in the analog signal is sent to the conversion circuitry, the pointer 420 into the coherent phase buffer is incremented. As such, the modem tracks the appropriate point in the coherent phase buffer 410 corresponding to a proper start of a potential patch wave.
- the transmission buffer has gone into an underflow condition. As such, no valid samples are available in the transmission buffer that may be processed into a proper analog output signal. However, when this condition occurs, the pointer 420 into the coherent phase buffer 410 will mark an appropriate start point from which the modem may make available to the conversion circuitry a coherent patch waveform. While the transmission buffer is still in an underflow condition, the modem will output samples from the coherent phase buffer 410 to the conversion circuitry. The conversion circuitry then transforms the samples from the coherent phase buffer into an analog signal which is then output to the remote modem over a communication link.
- the coherent patch signal is denoted as a dashed analog signal 490 , and the samples from the coherent phase buffer 410 making up the coherent patch signals are denoted as dashed arrows beneath the coherent patch signal. Each of the samples making up the coherent patch signal is taken the coherent phase buffer 410 , denoted as shaded.
- the samples from the coherent phase buffer must be supplied to the conversion circuitry until a suitable reattachment of the next valid sample in the transmission buffer is possible.
- the shaded samples in the coherent phase buffer 410 must be output, allowing attachment of the next valid data sample in the transmission buffer to the coherent patch signal. As such, the coherency and stability of an outgoing analog signal is maintained in presence of missed samples.
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US09/532,346 US6662321B1 (en) | 2000-03-21 | 2000-03-21 | Modem using phase coherence to adapt for missing transmission samples |
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US09/532,346 US6662321B1 (en) | 2000-03-21 | 2000-03-21 | Modem using phase coherence to adapt for missing transmission samples |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050281200A1 (en) * | 2004-06-16 | 2005-12-22 | Gerard Terreault | QAM signal analysis in a network |
KR100833337B1 (en) | 2004-06-16 | 2008-05-29 | 선라이즈 텔레콤 인코포레이티드 | Qam signal analysis in a network |
US20080273600A1 (en) * | 2007-05-01 | 2008-11-06 | Samsung Electronics Co., Ltd. | Method and apparatus of wireless communication of uncompressed video having channel time blocks |
US20090109938A1 (en) * | 2007-10-31 | 2009-04-30 | Samsung Electronics Co., Ltd. | Method and system for medium access control in communication networks |
US20100172296A1 (en) * | 2009-01-05 | 2010-07-08 | Samsung Electronics Co., Ltd. | System and method for contention-based channel access for peer-to-peer connection in wireless networks |
US8878620B2 (en) * | 2012-08-24 | 2014-11-04 | Tektronix, Inc. | Phase coherent playback in and arbitrary waveform generator |
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US4037049A (en) * | 1974-10-18 | 1977-07-19 | Intertel, Inc. | Modulator and demodulator for data communications network |
US4723288A (en) * | 1986-07-03 | 1988-02-02 | Motorola, Inc. | Stereo decoding by direct time sampling |
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US6327249B1 (en) * | 1999-08-04 | 2001-12-04 | Ess Technology, Inc | Data communication device |
US6501790B1 (en) * | 1999-07-09 | 2002-12-31 | Nms Communications Corporation | Method and apparatus for providing high speed modem replay using locally connecting modems |
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US4037049A (en) * | 1974-10-18 | 1977-07-19 | Intertel, Inc. | Modulator and demodulator for data communications network |
US4723288A (en) * | 1986-07-03 | 1988-02-02 | Motorola, Inc. | Stereo decoding by direct time sampling |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US20050281200A1 (en) * | 2004-06-16 | 2005-12-22 | Gerard Terreault | QAM signal analysis in a network |
WO2006007382A3 (en) * | 2004-06-16 | 2006-03-23 | Sunrise Telecom Inc | Qam signal analysis in a network |
KR100833337B1 (en) | 2004-06-16 | 2008-05-29 | 선라이즈 텔레콤 인코포레이티드 | Qam signal analysis in a network |
US20080273600A1 (en) * | 2007-05-01 | 2008-11-06 | Samsung Electronics Co., Ltd. | Method and apparatus of wireless communication of uncompressed video having channel time blocks |
US20090109938A1 (en) * | 2007-10-31 | 2009-04-30 | Samsung Electronics Co., Ltd. | Method and system for medium access control in communication networks |
US8837435B2 (en) | 2007-10-31 | 2014-09-16 | Samsung Electronics Co., Ltd. | Method and system for medium access control in communication networks |
US20100172296A1 (en) * | 2009-01-05 | 2010-07-08 | Samsung Electronics Co., Ltd. | System and method for contention-based channel access for peer-to-peer connection in wireless networks |
US8811420B2 (en) | 2009-01-05 | 2014-08-19 | Samsung Electronics Co., Ltd. | System and method for contention-based channel access for peer-to-peer connection in wireless networks |
US8878620B2 (en) * | 2012-08-24 | 2014-11-04 | Tektronix, Inc. | Phase coherent playback in and arbitrary waveform generator |
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